Drawing board attachment



May 23, 1950 c. R. RITTER DRAWING BOARD ATTACHMENT 2 Shee'ts-Sheet l Filed July 2, 1946 IVENTOR. @ifi/7l? 3761;

ATTD R N EYS May 23, 1950 C. R. RITTER DRAWING BOARD ATTACHMENT Filed July 2, 1946 2 Sheets-Sheet 2 INVENTOR.

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ATTE! R N EYB Patented May 23, 1950 UNITED STATES PATENT GFFI'CE `DRAWING BOARD ATTACHMENT Y curt n. Ritter, New York, N. Y. ljzmpii-catim; Julyz, 194e, serial No. 680,941

(ctw-131) Y.. ,2C1aims 4 The invention relates to a' drawing board attachment, and more especially to a draftsmans appliance.

' The primary object ofthe invention is the pro- -vlsion of an appliance of this character', wherein material of sheet form to be used'by drafts- 4men in mapping out drawings or the drafting of plans or other matter', can be conveniently held 'in place without the use of thumb fasteners, tackings or the like, onto a drawing base, bed or board, the appliance being of novel 4construction'and is unique in the assembly of its parts, which are 4few in number.v

Another object of the invention lis theprovision of an appliance of this'characten'wherein the material to be drawn 'upon is readily adjustable, so that it can be delivered into working position on the support constituting the drawing bed, base or board, and the drafting instruments are susceptible of wide range arrangement, While the appliance can function as a straight edge abutment for such' instruments during the use thereof.

A further object of the invention is the provision of an appliance of this character,` wherein its construction enables the association thereof with a drawing support, .which latter functions as a board for draftsmans service, the said appliance being a clamp for the material worked upon, and is conveniently releasable for the rearrangement of the material at will.

A still further object ofthe invention is the provision of an appliance ofjthis character, which is simple in construction, thoroughly reliable and efficient in operation, strong, durable, readily and easily handled with dispatch, and inexpensive to manufacture and install.

With these and other objects in view the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a fragmentary perspective view,y

partly broken away, of the appliance, constructed in accordance with the invention.

Figure 2 is a fragmentary vertical transverse sectional view thereof, showing by full lines one position and by dotted lines another position of the appliance.

Figure 3 is a fragmentary top plan view. partly broken away, of the appliance.

Figure 4 is a front View, partly broken away.

Figure 5 is a sectional view taken on the line 5 5 of Figure 4 looking in the direction of the arrows.

Figure 5a is a fragmentary detail view similar 'to Figure 5 showing a slight modification.

Figure 6 is a fragmentary perspective view showing the elements of the appliance before complete assembly.

Figure 7 is a, fragmentary plan view showing the use of a straight edge drawing instrument in place with respectv to the appliance.

` Figure 8 is a fragmentary vertical transverse sectional view showing a slight modification to the gripping edge of the appliance.

Figure 9 is a view similar to the Figure 7 showing a further modification thereto.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in det-ail, A designates generally a portion of a vertical stand, which in its entirety may constitute a work counter, bench or other support, and can be of any selected construction, having the side leg panels I0, and a.

flat top section II, which serves as a drawing board for drafting purposes, in structural designing and detailing by artiflcers, such as draftsmen, and in reality may be in the nature of a desk or the like. In this instance the top section I I is of elongated formation, yet it may be of any other shape, as may be desired under practical construction.

' The appliance constituting the present invention comprises a releasable clamping device, involving a pair of spaced stationary hinge leaves I2, each in the form of a substantially Z-shaped plate having a flange I3 at right angles to the intermediate portion I4, and a reversely disposed ange I5 at right angles to the said intermediate portion, the latter being of size to match the thickness of the top section II, for abutment with the edge thereof at the longer side thereof. The intermediate portion I4 of each leaf I2 is made secure to this top section II by fasteners I5'.

On the flange I5 is formed a pintle sleeve I6, for a, hinge pintle I'I, which is offset relative to the side edge of the top section II outwardly thereof, while the flange I3 is in overlapping relation to the upper surface of this section II, which is counterseated therein to be iiush therewith.

In the pintle sleeve I6 is the pintle I'I for the pintle sleeve |18 of a hinge leaf I9, which is secured to the inner side of a material clamping jaw 20 which is upwardly and inwardly curved for a distance over the top section II at the hing- Vsupport A, as should be obvious.

. top section II from within the vacancy 23 therebeneath, as is apparent from said Figure 1. i The jaw 20 has a straight gripping portion 24 accessible at the upper surface of the top section I I, so that a drafting instrument, asexampled at 25, in Figure 1 of the drawings, can make con-4 tact with this edge 24, in the executionrof draw-A ings onto the material 22, as carried forth by a What is claimed is:

1. In a drafting appliance for a drawing board. a pair of spaced hinge leaves, each of said leaves comprising a iirst ange arranged in superimposed relation with respect to the top of said drawing board, an intermediate portion dependingly carried by saidriiange and secured to the edgeY of said drawing board, a second flange arranged at right angles with respect to said intermediate" portion and having one end secured to the latter, a pintle sleeve carried by the other end of said second flange, a clamping jaw pivotally connected to said pintle sleeve, a straight gripping portion secured to said clamping jaw adaptedtocoact with the top of said drawing VVVboard forl releasably holding sheet material, manually-operable means secured to said clampdrai'tsman working at the counter, bench or other In Figure 5a thereis shown-a slightI modificationof the invention, wherein the leaf 2Bfhas a curved ange area 21 coinciding with the rounded corner edge 2-8 of the bench, lcounter or other support hereinbefore described, while otherwise the appliance is identical in construction, as before described with respect torFigures 1 and 2 of the drawings.

In Figure 8 .of the drawings there is shown a further modification of the invention wherein the clamping jaw 29 at its Aunder free edge 3U is provided with a resilient rubber'strip 3l so as to permit a iirm grip onthe sheetlike material 32 to be held thereby when drawing upon the same bye. draftsman or other articer toprevent slipping of the material when worked upon.

. In VFigure 9 rofthe drawings there is shown a further modification of the invention, wherein the free edge 33 of the clamping jaw34 is provided at its under portion with a. coating of adhesive 35, which maybe a substitute for the strip 3 I In Figure '7 of the drawings the Vdevice consti tuting the invention. has abutting the same a straight edge drawing instrument 36 asi commonly used by draftsmen in vshading or crosshatching VWork or other work execution when using the appliance onr a drawing board, bench, counter or support, as should be obvious.

Y If desired the appliance can be secured to drawing jaw for causing pivotal movement of the latter, andmeans carriedr by said gripping portion for maintaining said sheet material immobile.

"2;" Ina drafting appliance for adrawing board, .-a'pair of spaced hinge leaves, each 'of saidV leaves comprising a rst flange arranged infsuperimposedrelation with respectrto' the top of said ldrawing board, an intermediate portiondependingly lcarried by said flange and secured to the edge of said drawing "board, a I.second angearranged at right angles with respectto'said in#- termediate portion and having one end secured ing board section per se, having end cleats 3l, 50

to the latter, api-ntle sleeve carried'by the other .end of said second Viiange, a clamping jaw pivotally connected to saidV pintle sleeve', a straight gripping portion secured to said clamping jaw adapted tofcoact with the top' of said drawing board for releasably holding sheet material, manually-operable means embodying' a continuation lever secured to said clampingjaw'for causing pivotal movementof the latter, and means embodying Ya resilient strip carried rby said grip# ping portion for maintaining said sheetmaterial immobile. Y CURT R. ItI'lTlTJIt.V

REFERENCES CITED UNTE ySTATES PATENTS Meader i Aug. 16, 1932 

